This TS gives the stage 2 description of Unstructured Supplementary Service Data (USSD).
The unstructured supplementary service data (USSD) mechanism allows the Mobile Station (MS) user and a PLMN
operator defined application to communicate in a way which is transparent to the MS and to intermediate network
entities. The mechanism allows development of PLMN specific supplementary services.
full Table of Contents for TS 23.090 Word version: 15.0.0